I'm incredibly new to Wine so if the answer to this is incredibly obvious, well thanks anyway.
So I installed Wine 3.0, and then I installed the Windows Steam client by double clicking the installer. It took me a while to figure out how to find the installed Steam client, but anyway. It works, and I can run some games, although some of them have some graphical glitches. :(
Anyway, so I tried to run a new game and it said I had to be on a 64-bit operating system. I have no idea how to make the client think that I am in fact in 64-bit though. Anyone know?